Could be be pregnant? Please help!!

I'm gonna to be really detailed so here it goes.. My fertile window was the 13th-19th of this month me and my boyfriend had sex twice the 17th no protection and my ovulation day was supposed to be the 18th. The 22nd and 24th (the 19th and 21st day of my cycle) I had light pink spotting the was only visible when I wiped. It wasn't much at all and barely anything but definitely noticeable. Today the 29th I woke up cramping like I was going to start and nauseous with no appetite what so ever. I also started spotting old blood (brown) then it stopped it wasn't much but more than the previous times. AF isn't due until June 1st however I'm cramping continuosly and was wondering if I was experiencing pregnancy symptoms. Please comment I posted several posts before this and haven't gotten a response.