So confused

Ok so now that I am pregnant I am super confused. I had a period January 19th. Then I thought I had a period Feb 15th. It was heavy the first day, stoped completly the 2nd and then was moderate the third. I am wondering if this could have been implantation bleeding. I thought that was supposed to be lighter than a period but its strange that it stopped completely. The reason I am so confused is that I was feeling symptoms strongly before implantation would have taken place if I did actually have a period in february. Also I took a pregnancy test (first respose early detection) 6 days before my next period and it showed up loud and clear. It’s not supposed to even work that early. I don’t know. When I was pregnant with my son it didn’t show on a test until 2 weeks after I missed my period. Most doctors won’t see you until you’re 8 weeks unless there is a complication. I’m so confused as to whether I am 3 weeks (and it showed up perfectly on a test- seems unlikely) or 7 which might explain why I feel so horrible. Anyone go through anything similar (pregnancy showing up this early on a test, STRONG symptoms in your 3rd week:sick: )? HELP:blink: