Has anyone ever had this happen?

Has anyone one ever had implantation bleeding a few days before their period, and gt a really wierd period, then found out they were preggo? if so how lng did it take before u got a positive, have u ever just felt preggo, but didnt know when to test. Is sensitve smell a pregnancy symptom? Also i noticed alot of women say their cervix is high how can u tell? During sex? i appreciate all the answers and baby dust to all