I need some advice!!!

So I had my birth control taken out Feb 26th and started my period the 28th and it went through Mar 5th. The week of the 15th was fertile window. I was supposed to start my next period Mar 31 and it's yet to come. I took a pregnancy test Apr 1st and it came back negative. I tookanother one yesterday and this morning and they're faint positive. Is it possible to have positive test yet???