He Just doesn't get it!! 😩😩😩

So me and my BF have been dating on and off for 2 years which I've been on BC the whole entire time. In June I ended my BC and ended up pregnant in July and didn't find out until I miscarried in mid August. AF didn't show back up mid October and then she showed up again the other day, and all he could keep saying is 'I'm surprised your not pregnant yet' and he said it again last month. He doesn't know how bad it irritates me because I feel that he's counting the whole 2 years I've been on bc and it's like he's trying to say that something is wrong with me because I've never been pregnant by him until the mc. How do I explain to him about ovulation and fertile days in the proper way... I tried to tell him about the fertile days and then he just says ' well I know ppl who get pregnant back to back'  I believe he thinks this miracle happens whenever you say so and he's so insensitive at times. Like dude come on?! We've only been "trying" for one cycle smh Ugh! I'm so frustrated 😩😩😩