What Causes Bloating And Gas After Resuming Birth Control Pills?

I m just gonna describe to you exactly wha happened haha. So on June 4th I had what was kinda like unprotected sex. It was actually more like unprotected grinding, he never came, I m just worried about pre cum. That same day I was supposed to start my period, so I was already going to be late. Well about 5 days after I took a pregnancy test and took the plan b pill. Still, no period. About 9 days after unprotected sex I took another pregnancy test and it was negative. The next morning I started my period. It was heavy for 3 days and light for 5. I don t think I had to worry anymore. 3 days after I ended that period I started birth control. The week I was in birth control I was CRAZY bloated and very very gassy. So I was worried about pregnancy again. I took another pregnancy test about 2 weeks after unprotected sex. Negative. I got off birth control cause I thought maybe the side effects caused the bloating and the next morning I started my period again. It was light at first, pinkish brown. Then got heavy. It always had brown in it though. My bloating went down and everything seemed normal again. I took 2 pregnancy tests just to make sure, negative. At that point it was like a month after unprotected sex. I ve been taking pregnancy tests periodically throughout the past 2 weeks and they ve all been negative. But I ve noticed I have to pee more often and just today I started getting bloated again and my boobs hurt. Although I started taking probiotics 2 days ago so that my cause the bloating and my period could possibly be any time now that I screwed up my schedule by stopping birth control mid pack. I took a test yesterday and it was negative also, your opinion?