Does Cramping, Swollen Breast And Heavy Menstrual Bleeding Indicate Miscarriage?

I am 20 years old and about 2 months ago my period was 2 weeks late. I was also having cramping, having nausea, feeling dizzy, and my breasts were sore and swollen. I finally took a pregnancy test and it was one that showed 1 line if you are not pregnant and 2 lines if you are pregnant. After taking my pregnancy test it showed one and a half lines. I was going to go to a clinic to take a pregnancy test there, but a few days later my period started and was worse than ever with much more blood and much more cramping and clots. Is it possible I had a miscarriage? Or was this all just a coincidence?