Cd 37 on clomid, had implantation bleeding but all bfns? thoughts please.?

ok, last months cycle was my first on clomid that cycle was 31 days, with ovulation on cd15, lp was 16 days. this month round 2 of clomid, ovulation happened on cd 14 and cd 15 that was feb12th and 13.then on cd29, feb 27 i went potty , wiped and i had a spot of red blood on tp. and i had the brown discharge (implantation bleeding?)on cd 32-cd34. thats march 2nd- march 4th. now today is cd37. i took a first responce this morning and its negative.i took one 2 days ago as well, it was negative too.my look a lil browner, sensitive but not bad, i pee about every 3 hours but thats almost normal, really i have no signs of pregnancy except for , i heard congestion could be a sign, and every now and then ill have a little extra cm. so do you think im just late, or maybe not enough hcg to pick up a bfp yet?thank yous in advance, and baby dust to all