Could I be having a miscarriage?

Hi my fiancé and I have unprotected sex so there is the possibility I could get pregnant, I don't have exactly the same periods every month but they don't differ as much as this one has. I started bleeding on sat the 6th and had two days of a medium amount of bleeding. The second day I had a tampon In and had like a rush of clear liquid flow past onto my underwear, with little blood on the tampon when it was removed. The next two days have just been some heavier spotting, but not enough to fill a tampon. I've also had some tiny clots as well. I normally have very bad acne and cramps with my periods and the periods normally last around 5-7 days with them being pretty heavy. I haven't had an increase of acne and absolutely no cramps. I had a miscarriage back in August, but have had normal periods until now. I haven't taken another test (I took one last week and it was neg) because I thought this was my period, but it just seems weird. Sorry for the long post! T.i.a.!!!