Sex Drive on Overdrive

Co

35 almost 36 weeks pregnant. I haven't had any form of sex drive this entire pregnancy. I seriously couldn't have cared less about sex from the time I got pregnant to probably yesterday. I can count on one hand the number of times we have had sex since I have gotten pregnant. Including the 2 times today probably 5 and I probably wanted originally 1 other time besides today. I don't have the highest sex drive in the world but that still isn't normal. I was used to at least 3 times a week and prior was daily sex and I have refused sex for months. My fiance became so concerned when I came into the room and just started in today that he threatened taking me to the hospital. It has been fun today to say the least. However kinda curious why it just now started at this point in my pregnancy? Any ideas? Last few days I have been having hot flashes, trouble sleeping, and it looks like just before my period starts on my pad(that brown discharge).