First period is late after miscarriage

I miscarried back in June and I was around 4-6 weeks. My cycle is normally 28 days and I’m currently on 36. Period is 7 almost 8 days late. I was safe when I began having sex again, using condoms and checking. My breasts hurt, I’m emotional as crap and I’m hungry! I haven’t wanted to really eat since my miscarriage too. I’m sure being late is normal but I’m just confused and I just wanna get this one over with. It was my first miscarriage and it was very traumatizing not to mention I had a very rude and rough doctor who basically didn’t know or care what he was doing. I was 17 at the time and now I’m 18. So I really had no say in what was going on. Please just tell me it’s normal to be late. If I’m somehow pregnant again, by some miracle, I might actually lose my mind. I can’t lose another baby.