My last period was Feb 21. I took the fertility pills "clomid" as prescribed by my doctor. I got pregnant with these pills before. I haven't gotten my period yet but I'm not regular. According to this app's calculation I should be 3 weeks and 6 days today. I've been feeling pregnancy symptoms since week 2 like really sore nipples, fatigue, cramps (not alot of them), and cravings. I don't remember seeing any implantation bleeding and I took a pregnancy test yesterday morning which came out negative. Did I take it too early? What's the possibility of me being pregnant?