Hello, I Had A Question Concerning If I Am Pregnant

Hello, I had a question concerning if I am pregnant or not. On May 29th, I had unprotected sex with my partner. On June 6th, I experienced light bleeding that lasted for 3 days ending on June 9th. On June 10th, I had unprotected sex once again with the same partner and he ejaculated in me. On June 11th, my partner and I had unprotected sex and he ejaculated in me. It was then on June 12th did I decide to take Plan B One-Step. I did not experience any bleeding throughout the rest of the month. Starting July, I started to feel symptoms. For two weeks, I was often nauseous, experienced fatigue, moderate headaches, I often felt the need to vomit but never have, I am easily & frequently tired, I often feel sleepy, my breasts have been extremely sore and my nipples darkened, I have moderate cramps in the lower abdomen, I have lower back pains, and I've been losing my appetite. I normally have my period the first week of every month but it has been a little over three weeks since I've had my period. It is now July 19th, for the past 3 days I have experienced bleeding. On July 16, I experienced light bleeding. On the 17th, I experienced a little more bleeding than the 16th. I didn't bleed on the 18th but the 19th I experienced light bleeding. I don't know if the side effects of Plan B have taken place or if I am pregnant.