I don't know if I could be pg. Was 2 1/2 wks late, then sho

I've never done this before..but here goes! I'm 33 years old. My husband & I tried a few years ago to have a baby. Long story short...unexplained infertility. Got it all out of my system. Then I was like 2 1/2 wks late. Took 2 home pg tests, both had "faint" positives. Then I started for about 36 hours. I have been so tired I feel like I could just pass out, sore nipples, dizzy & lightheaded, bloated crampy, backache, headache...also, I had a period with my daughter 13 years ago. So when I went for the first time he thought I was 6 to 8 weeks along, but ordered a ultrasound for 3 days because of a small uterus, and I was actually 12 wks & 5 days? Does anybody have any input? Thanks %-)