Should I be concerned?

Let's lay it all out on the line: In March I had a normal period (It was 3-4 days long) that started on the 11th. My period usually comes every 32 days, two days later than it started the month before. On Friday April 2nd I had unprotected sex (big mistake I know) and I while I know he pulled out I don't know if he started cumming while inside me. I thought nothing of it as my period was due a little over a week later on the 13th. On the 9th I had some cramping which is normal for me but I started my period which has never in my life started early even when I'm stressed. Soooooo, on the second day of the period it stopped, then on the third day started once more for about half a day then stopped again. After that I had one patch of blood (spotting I guess) and it was over. I have had a lot of strange things happen with my period at times but it has never stopped then started. This week I'm feeling sick at random times and I have cramping but I don't know if its just because I should be ovulating in a couple days according to an online calander thing. If anyone has ideas or just wants to say, "hey get over it you're fine" I will listen. Lol. Thanks for looking.