I'll tell you what happened with me, see if it helps?
I got my BFP on the Monday and again right through to the Wednesday(think i took about 8!), On the Thursday I did another and got a BFN and freaked out, DH had been working away and was due home Thursday night so this test was to show him!.... I did another 2 both neg I knew something wasnt right and my wee beenie hadnt stuck at this point and felt so useless and hysterical .. that night after DH got home i cried and cried but he didnt really feel the same as he hadnt even known i was preg to begin with! I started spotting that night and AF hit me hard on the Friday (my birthday) AF only lasted about 3/4 days and i was determined to get "back in the saddle" so to speak lol so we started BD around day 3, as after a chem you are more fertile! I am now 32 weeks pregnant with the little beanie we conceived about 3 days after chem preg AF finished.
So my chem was in the September and i was preg again by the October, if you are having a chem preg hun please dont think it's the end of the world.. your body now knows what to do and hopefully next month your little beanie will stick real good! All the best and stay positive! xxx