Pregnancy and cramps

I was supposed to start my period in a couple days but something just told me to take a pregnancy test. I haven’t been sleeping and my boobs are so sore. I have pcos so getting pregnant has been a nightmare. I have a 7 year old daughter. My pregnancy with her was very normal. I was young. When she was 2 I had a miscarriage and since then I have not been able to get pregnant. I took the test and it was positive but I have some slight cramping. I’m worried as I can’t really remember if this is normal or if it’s signs of miscarriage. Again :(