Embarrassing 🙄

So this is embarrassing but my boyfriend had broke up with me April 7th 2019. I had sex with someone else on June 4th and got my period June 5th. My boyfriend and I got back together June 28th. I got my period again I believe June 30 or July 1st. I got a positive pregnancy test August 1st after getting a negative one 3 days before August 1st. Then the hospital had scared me because they told me they couldn’t see anything in the ultrasound and I could’ve been TOO early so they thought it was an ectopic pregnancy. On August 12th they seen a little something and I believe they told me I was about 5-6 weeks pregnant. CAN YOU PLEASE EXPLAIN TO MY BOYFRIEND THERE IS NO WAY I GOT PREGNANT IN JUNE . Please ladies! I’m now 29 weeks and 3 days. Almost done and NOW he brings this up?!????