TMI‼️‼️

So I had my period May 1st through May 5th. It was four days late but my period has been irregular the past three months due to coming off the pill in early February. My period this month was normal flow, which for me is a lot. I had clots also. I changed tampons twice a day. So today being May 7th I’ve noticed I’ve been feeling... strange. Light headed, nauseous, dizzy, shaky. Could I be pregnant even though I got my period? I had unprotected sex sometime in April, possibly as late as April 24th. Unprotected meaning my fiancé goes pee, puts it in for a minute and then puts a condom on before he finishes. This is what my period was like, well a picture of a clot. My period was pretty heavy. If the possibility is still there, when can I test? I tested last night with a negative result. Please don’t be rude!