Conception dates

[kca321]

Slightly embarrassing but its something that’s really playing on my mind….
I broke up with my bf last year. We both started dating others but would also hook up with each other quite a lot too. I’m now pregnant, due 9th June. I was having very irregular periods so my due date changed by 2 weeks according to ultrasound. Conception date is approx 16th September (as google says)
I had sex with a guy on 4th September and used a condom. I then had sex with my ex on 11th & 12th September with no protection. It seems highly likely that my ex is the father but I need some reassurance here?

Hello, I’m after some advice please.
In June I had a miscarriage. I bleed for a few days around 4. Me and partner, had sex, and continued for the rest of june. Then July, we fell out I did not see him. No sex for the whole of July. I had a period on the 12th of July for four days, and again on the 19 of July for 6 days. My periods are usually irregular. Then this month we started sleeping together again. My period is late. So I’ve done a pregnancy test, I did a clear blue, it’s came up positive 2-3. Would this mean I conceived in June? Because I tried to work it out I thought I’d be 6-7 weeks pregnant. Or would I conceived in August, and I’ve found out super earlier. Or is the pregnancy test just picking up previous pregnancy from my miscarriage. I’ve tried calling my
doctors but she wasn’t much help and said to wait for an emergency scan but that could be 4-6weeks wait.
Thankyou x