Questioning?

Okay tmi but I want to find answers but there going to be hard to find... so I keep and track on my ovulation and it started 2-8 of this year January and my last period started of last month on the 21st. I’m now 4 days late this month ?! I don’t know what to think and my body feels different I seen stretch marks I didn’t know I had and I been sexually active with my boyfriend and we don’t use condoms he just pulls out ... I did had some little bit cramping around my lady area and went away my back hurts I have to prompt my back up with pillows. Can’t eat my favorite foods or I get sick but nothing else and peeing a lot . And my body produces low HG levels where I can’t take a lot pregnancy test it won’t read it right cause two years ago I had a miscarriage I went to the doctors and take a pregnancy test still negative and home pregnancy test too but no new answer I threw up had alot symptoms and I didn’t even knew about and so I didn’t think of it and stress and panic thinking my period will come and no show for 6months to I had pressure and pain so bad I screamed so loud and it was like that pain was bad and the nurse took test and did ultrasound and found out I was and the baby didn’t made it and I cried and they gave me medicine and that I found out I was pregnant ... please help !!!