Have you all read Taking Charge of Your Fertility? If not, DO. As for a window, (and I say this realizing that our bodies are all different) you should have between 2-5 days to possibly conceive, whether you have sex the day before you ovulate or not. That is, you can have sex (again, individuals vary
) up to 5 days before O and still get preg. What I did was start BD-ing on day 10 or 11 of my cycle, and then BD every other day (so 10, 12, 14, 16...) until I O'd. That way, I have spermies in my system all that time for whenever I O.
RosesToys - About starting on 100 mlg. Clomid (I know you didnt ask, so forgive if not my place), from what I understand you *should* start at 50 and if that doesnt work, then go up (maybe you did this and I missed it). Also, Clomid should regulate your cycle so that you are cycling between 28-31 days, so while you are using it, you wont have to wait so long for each cycle, however, it is not recomended that you do ... well, some docs say more than 3, some say more than 6, cycles of Clomid because it thins your uterine lining with each month of use and makes conception a little less likely
(another reason why starting with 100 mg is maybe not a good idea?)
There is a website called, well, the site is at inciid.org. There you can read up on a lot of this and there are places where *experts* answer questions which I found helpful to read 9the questions and answers of others).
Good Luck everyone!