Is something seriously wrong?

I am 20 years old and AF has been missing for 11 days now. I average a 30 day cycle and its been on time for 2 months. Explanation at bottom. I was 6 days late I went to hospital because I was throwing up and a bit under the weather. They did a v-ultrasound but saw nothing and blood test and a urine test said I am not pregnant. I'm having almost every symptom. I am nauseous on and off throughout the day, my period is long overdue, I'm bloated, gassy, I have been running to the bathroom 6+ times a day, I even spotted a peachy light pink on 10/05 but next day nothing, my bbs hurt time to time and I'm tired 24-7 I have been a verging 12 hour sleeps at night and been napping throughout the day. I have taken 6 home tests and all come out negative. I was told by the hospital there's nothing wrong. End of may I found out I was 2 weeks pregnant, then June 11th I started to bleed and had vicious cramps, so i went to hospital and was told I was miscarrying. Jun 15th I found out I had a tubal pregnancy and that my body is trying to miscarry it but it's not leaving. So I had gotten a shot of methotrexate and they tested my blood levels a week later on June 22nd they gave me another shot after testing my levels that were rising rather than dropping. I went from 160 on June 11th to 190 on June 22nd. After the 2nd shot they tested my levels every week till July 1st and I was no longer pregnant. AF came in july and August directly on time and now I'm late. I had done the BD with the fiance Sept 7th, 11th and the 24th. AF was due the 26th. Can anyone help me understand what's going on? I am so lost on if I'm carrying or just bad luck.