Hello, I'm On Birth Control. My Boyfriend And I Had

Hello,
I'm on birth control. My boyfriend and I had unprotected sex on Saturday and he finished in me. We did not have sex the next day but I forgot to take my pill that day and for the next two days. I had withdrawal bleeding and began to feel twitches in my lower abdomen. I was also extremely tired. I took a pill Thursday but still felt twitches in my lower abdomen and I also experienced some mild nausea. Today(Friday) I woke up and my stomach was very bloated and heavy feeling. I'm also still very tired and my breasts are sore. My period or withdrawal week is supposed to come on in 2 weeks. I know that when I had sex I was protected but I also know that sperm can live inside a woman for 5 days. Could I have conceived during the days that I didn't take my pills?