So I got of my because last month got my period march 15 ended march 22 had intercourse on march 26 and on the 1st I started spotting light pink and brownish then two days later it got a little heavier I'm super light headed idn if I can be I didn't get any of this with my first son

Birth control is not 100 percent and were you on the birth control a full month, or just started during the month?

So yes of course you could be pregnant, but it would be too early to start having signs and light headed would not be one at this early stage normally. Perhaps another illness or reaction to BC medication