Brownish Cervical Mucus Before Period Help Me Figure This Out Please ....?

Help me figure this out please ....? - brownish cervical mucus before period

I thought AA had a few months pregnant, I had several tests that are negative, and I am still negative. I had many symptoms of pregnancy. Last month, approximately 2 weeks before my period I had cramps in my lower back and went into the bathroom, my account cervical mucus was smeared with blood have and colored pink for 2 days this time around ovulation. After 2 weeks of 28 May I have a period of 2 days. Day 1 is lighter than normal, day 2 only brown mucus has disappeared, the test is negative, the problem begins on IM and not show in my head b / c my sister has the same problem that when I'm pregnant, is 11 weeks by the time I had sex, my belly is round and bright, and it is difficult to fold completely formed on each side of my hip bone. What should I do?