Help the wait is killing me and I'm getting discouraged.

Kimber • Stepmom to one👩‍👧Pregnant with Baby #1🤰🏼 Due Jan 2020.

Me and my husband are TTC. I had what I believe to be implantation bleeding on 7-10 and 7-11, it was EXTREMELY light and lasted only 2 days. I took a test on 7-12 it was was a BFN, I have experienced cramps, backache, felt not like myself on 7-15. I took a test this morning but it was also a BFN. Is it possible I tested too early, but can still be pregnant?? AF is due this weekend.