Hi everyone!

i just have a couple questions I was hoping someone could help shed some light on.

April 24-April 28 was my last period. After about a week, my husband and I had sex three days in a row, trying to conceive. On the 14th of April, I had a light bleeding that I thought could be implantation bleeding. More very light spotting again on the 16th and the 19th. Didn't really have any other symptoms, other than minor back pain and cramps. HPT turned up negative, so I assumed I needed to wait before taking another one. Had no bleeding the last five days so I assumed I was late, or pregnant. 

Today, I noticed some blood, like a period. Way lighter than usual, but still blood. Does this mean I'm not pregnant, or could this be early pregnancy bleeding?