Hi. I Have Felt Weird Things Just Recently After Or

Hi. I have felt weird things just recently after or during ovulation, and I guess I felt some of the symptoms of pregnancy. The first day of my last period was June 2, 2015. We had unprotected sex on June 13, 2015. A day after that, I felt some twitching on my lower belly. It happened until the next week, but only for some minutes or hours and not daily. There was also a time when I felt prickling sensation on my mid ab and on my left lower abdomen which lasted some second or few minutes. Then I noticed that my cervix was elevated and was really bloated all days. Sometimes my breasts are tender and felt some dull backaches especially at nightime. I also felt that my belly is heavy all days. I tested all negatives, though. Then on July 4, I had brown discharge with dark mucus. Then there was dark blood the following day but it is scanty. I always have heavy bleeding on normal periods. This was also the time when my period should come, though my regular cycle is between 28-32 days. It is sometimes 33-37 days whenever we had sex around ovulation. But no cramping on belly this time but my back is aching a bit. Still I tested negative on urine test. Is it normal to have this pregnancy feeling plus these early sensations, which I never felt during my first pregnancy with my son. I nearly thought of going to a specialist. To rule out any problem with my abdomen, if not related with pregnancy. I always thought of undetected miscarriage at early weeks, as I am always stressed at work and at home with my 3 y.o. son (his father is not with us because of his work). Please advice. Thanks.