Light pink spotting on 7dpo and 8po and and brown spotting on 11dpo...help!

I had unprotected sex on may 16th, the 14th day of my cycle. I think that should have been my ovulation day but I'm not 100% sure. On 7dpo and 8dpo I had light pink spotting only when I wiped. I've had lower abdominal pain since 7dpo and I'm now 11dpo. I've also had breast pain as well. I noticed my areolas were stretching yesterday and my nippes were darker. I just haven't felt right this past week. Today I had light brown spotting that ran out and was gone within seconds. I'm very regular and I always have been and never really experience spotting or anything before my periods. I have a 28 day cycle. I've taken several pregnancy tests and they have been negative. I took clear blue plus and the $ tests. Could I be pregnant and it's too early to test? Has anyone else experienced these symptoms and got a bfp? I already have 2 healthy boys and dont remember having these symptoms with them. Thanks in advance for the feedback.