Just keep taking it. Most of the tests are DNA tests anyway. No aspirin can screw those up. They are super expensive though. Typically, unless you've got family members with early death from stroke or history of blood clots, they don't usually find anything. Because you've had babies before, any of the immune things are more likely than clotting issues. You can't test immune things in pregnancy, or for a while afterwards. You get false positives from the natural immune changes of pregnancy. I'd suggest thyroid + general pregnancy labs. HCG tests (2) to check doubling. If you haven't got doubling, it's really to late to rescue. I'm sure skeptical about progesterone, as I think, for the vast majority of women, the progesterone is low B/C the pregnancy is failing, not it's failing b/c progesterone is low. Ultrasound isn't usually recommended til 6 weeks, unless you've got risk factors for ectopic. You've got a LONG two weeks ahead of you. I'm sorry. The good news is, even after many losses, you still have a 60% chance of having a baby! A real baby to join your family, no matter what you do or don't do.
Thank you for all of the info, Jane. If it is an immune thing, and they can't diagnose during pregnancy, will they treat me somehow in the meantime just on the off chance that that's the problem? One of my coworkers just had her rainbow baby after like 4 losses, and they had her on steroids and blood thinners even though they had never found any official cause for her m/cs. Wow, this will be the worse TWW ever, even more so b/c two of my three losses happened between four and seven weeks. But I've made it another day, so that's something.
ahh, I get busy for a couple days and things get busy here! lavatea, YAY!!!!
Keep growing healthy, baby! 
Check out the first page and then let me know what you want it to say for you.I think I'll address this after the appointment Wednesday, if you don't mind. I just need this to feel a little more real first, I guess.
TWO!!!!
Two beautiful little perfect babies with two strong heartbeats (both at exactly 142)! They said they want the heartbeat to be between 120 and 180 at 8 weeks, and at least 115 at 7 weeks, so here I am with my awesome strong little embies pumping away well above average! Baby A measured 6w5d and Baby B measured 7w exactly. So cute!!!
Lavatea, I'm so excited for you to join us!!! AHHH!!!
MBA!! TWO babies! That's so awesome!! You were right all along.
But now I need to say what I logged on to say, because I'm feeling really sad for my Baby B and this is a safe place, and I'm sorry if this is terrible timing to say it. At prenatal yoga tonight I saw two mamas that I went through fertility treatments with, and they're both pregnant with twins. One I knew about and one who is more recent. Both are doing great, and I'm truly deeply happy for them. But it hit me hard as a reminder that we lost our Baby B. And at the same time I'm filled with self-....loathing?....because we love our little girl with everything we have in our hearts, and I am truly, deeply, humbly, joyously grateful for her. And while I was thinking all this that fear came back, that I realize I haven't consciously strongly felt in a while, and I just keep repeating to her "please, please, please keep growing healthy and strong." And the precious darling little one kept kicking me the whole time saying "I'm here, Mommy!" It's all a lot to be feeling at once, but I wouldn't change this for the world. Please, little girl, stay with us, stay healthy, keep growing strong!
Oh, Tear. Isn't PAL awful? And it has to be compounded by the fact that you're carrying the twin still. Allow yourself to grieve, even if it's in some small way, whenever you can. It's weird to say, and I didn't believe it once upon a time, but somehow it does get easier. Or at least more distant. I used to sleep with Avery's baby blanket every night. Now I can't tell you how long it's been since I did that. I still think about my babies, but life has a funny way of moving on whether we'd prefer it to stand still or not. And then, wham! out of no where something will still hit you when you least expect it. I was crying during nap time today b/c I miss the babies I'm never going to hold and I'm petrified for this baby. It's not an easy ride. I'll say a prayer for you.
and it's so funny, as a mom you want to give them anything they want and I just can't seem to do it. So I need twins 'cause I gotta give him what he wants.
Our little girl has been clunking around like a boxer this weekend, so that has definitely helped us focus on the joy.
Asher is a DOLL! 
. (Just kidding, but I can't find the laughing smily). Seriously though, Congrats on quitting your job.
Follow Mothering