Could someone please help me figure this out? :) BFNs and BFing 19-month-old

[lawschoolmama]

So I have two DDs, one just over 4 years old and one who's 19 months old.  The 19 month old still nurses rather frequently, and no PPAF yet (although PPAF came at 19 months with DD1).  DH and I DTD exactly two weeks ago, with no protection other than the fact that I have no PPAF yet.  Then, one and two days after that, I had really heavy egg-white-type CM--the first time I've had that since DD2 was born.  Then, the past week, I've been feeling really weird--these weird, super sleepy episodes every afternoon, just like I had during the first trimester with both DDs.  Today, I started having some weird joint pain, especially in my fingers and knees.  In short, I'm feeling really PG--but I've taken four (yes, four, silly I know) HPTs since Weds., all negative.  The most recent BFN was today.  I just can't shake this feeling that I'm PG--but is that even possible at this point, with a BFN today?  Any thoughts about whether this is at all possible, or should I just give up?  Wait and take another test in a few days or a week?  Help, this is driving me crazy.  For what it's worth, I would like to get PG again, but feel hopeless with no PPAF.  I've ordered maca and vitex online though, so maybe that will help....TIA!

[jee'smom]

it took me several days, and my friend a full week, AFTER af was due, to get a bfp with one of our pg. i say wait several days and try again! (dont be ebarrased about poas 4 times... i've poas about 6 times this week because i have symptoms of pg, and af is late, which it never is. all bfn!)

good luck!

[lawschoolmama]

Thank you so much!  I must say that's a bit encouraging :)  I wonder how long I should wait?  I had BFPs with both of my DDs at about 10 dpo, but I've heard each pregancy is different re: when you can expect a BFP?

[jee'smom]

i would wait until 3 weeks after the supposed conception, take a test, and if it were bfn... i would think i was not pg.