Can someone help me understand recurrent Chemical Pregnancies????

Candace
I have been ttc baby#2 for almost a year now... we have one 7 yr old already, so it's been a while since I've been pregnant. Anyway I've now had chemical pregnancies my last two cycles. This one I even waited until after my period was missed to test, got a positive on Monday, then AF today. Doc did not seem concerned about the last one, but now that it's happened again, I am confused and feeling like there could be something wrong. Anyone had more than one?? My LP is usually 12 days which I feel like is in normal range... Idk what else I can do to make my beans sticky! Someone help. I'm so heartbroken over here.