I need advice. I am very worried. So I had sex the day my period ended. We used a condom At first and he finished in it, couple minutes later he went in with out a condom because we had ran out, in not sure if cum got in me or not or if the cum from before went in me. I took plan b around 12 hours later. 5 days after a plan b I bleed like if it was a period for about 4 or 5 days. I had nausea for a couple days too. It is exactly a month from when that happened and I have not gotten my period. I feel really nauseated after every meal burp a lot , my left boob is swollen and hurts also feel constipated. I took a preganancy test but nothing came up. It was blank. I need help ??? Has this happened to anyone? Is it just symptoms of the pill or can I be preganant?