Possible Misscarrige

Nicole

So me and my boyfriend have been trying for a year and a half now and about 5 mounts back I was 14 days late and getting faint but kinda dark pregnancy test and I thought nothing of it and I ended up started my period or so I thought but it was 13 days long with very heavy bleeding and very sharp cramps and a lot of blood clots. Could I have had a miscarriage without realizing it or could I have had a chemical pregnancy?