Faint positive

So I have a few questions I have many faint positives since Monday evening went to doctor yesterday for blood work and test but there test was negative my cycle has been really weird Oct -nov was 28 Nov - dec my cycle was 40 days got bc out in December didn't really pay much mind to my cycle being longer thinking it was the birth control coming out thought I would get my period Jan 25th but I didn't and been testing and I just started get positive did any get a negative at doctor be get positive at home so for the long post