Hi I Took 5 Pregnancy Test Over The Past 3

Hi i took 5 pregnancy test over the past 3 days and they have all come back positive. this morning I woke up feeling extremely nauseous and a little light headed. when I went to pee and wiped a noticed some blood on the tissue but it was mixed in with a lot of discharge so I assumed it was implantation bleeding until I went to flush the toilet and saw blood in the bowl. Within 3 hours I seem to have been experiencing a full on period with cramps and everything. This is not as heavy as my regular period and there only little grain sized "blood clots" in the bowl but I am afraid I am having a very early miscarriage. what do you think?