does ovulex make your period late

Hello.... I'm Ashley and I have something really odd going on. My fiance and I are trying for a baby. Well my last period was June first. I went to the docotor on July second and got a urine test done done. It came out positive!!! We were so happy. Well two days later on the forth I started bleeding. It was just spotting at first then it got a little heavier. I got worried that something was wrong with the baby so I went to the er. They dropped another urine test and they said it came out negative. So we thought I had miscarried and the bleeding continued for my normal week but it was lighter then my normal pierod. I'm a heavy flower but this was light. Now I'm bleeding again! And its only been a week. Can someone give me some advice? Please? Did I miscarry should I go see an on?