Really need some supportive advice

So I’ve been reassured my whole pregnancy about who the father is,

My due date is 13th September.

I DTD with a friend night of 1st Dec-early hours 2nd Dec, just the once and he didn’t finish. I came down badly with the flu 3 days later and a couple of days in I fully remember bleeding heavily (kept leaking into my pants) from 7th Dec and it lasted around 7 days.

Me and my ex rekindled a couple of weeks later and DTD 19th and 24th Dec.

I found out I was pregnant on the 12th January and test said I was 2-3 weeks from conception (4-5 weeks).

5 days later I had an emergency scan and no fetal pole or HB was seen so I was dated 5+3 (due date would of been 16th September).

I had a further private scan and the dates agreed +1 day.

Dating scan agreed +2 days and gave me a due date of 13th September.

Baby has been measuring on point since, even at my growth scan at 36 weeks.

Every single thing points to my partner being the father, but I keep having nightmares that the baby isn’t his. My midwife has told me to rule out the first man.

I suffer from extreme anxiety and I’m worrying about it everyday.

Am I right to worry????

Picture was taken on the 13th Jan FMU.