I Got My Period Late Last Month By A Few

I got my period late last month by a few days normally I'm right on time. The day before it started I noticed two pinhead sized balls of blood when my period started it was orange and thin with no pain or cramps. I suffer from PMDD but again this month there has been no pain however real emotional, some nausea, and I've been measuring myself this month and I've gained an inch on my bust measurement, have lost inches every where else and my belly has changed shape from being rolled over to pulled up so that I can just see my c-section scare when looking in a mirror.
Alls I've done for exercise was walk 3 times in one week three weeks ago? Now this month I'm two days late and just found a pinhead sized ball of blood in my panties again! I will be 36 at the end of this month and yes I was having unprotected sex 6 weeks ago and before.