Not trying but not not trying tc

My period is irregular the last time I had my period was on March 23-28. I've had unprotected sex a few times since then but he didn't finish in me. My period is still mia. I took a test about a week ago but it came back negative. I've had slight discomfort in my lower half of my boobs & ive needed to nap a lot more lately. Im unsure of what to make of it.