Help!

I have been taking birth control for about a year now. I started a pack 4 weeks ago (just started my new one today). I was on about day 3 when I noticed I was missing the Thursday pill from the second week, when that Thursday came I took the pill from the Thursday of week 3. Once the Thursday of week 3 came I missed it and took my pill on Friday as normal along with the days following that. The Sunday morning after the missed pill on Thursday my boyfriend and I had sex, but he did not finish inside of me. On Monday I started bleeding like I was on my period and it lasted for about 4 days, it was slightly lighter than a typical period, but still a fair amount of blood. This past week was the week I was supposed to get my period (according to my birth control schedule) and I did not get it. I'm thinking that I got my period a week early because of the missed pill, but I'm not sure. Around the time I was bleeding I had PMS symptoms like I do when I get my period. Please give opinions on what's going on or advice. Anything is helpful!☺️