Need opinions please!

So I was on Depo for almost 4 years. Was on the pill for a month or two before that. I got pregnant January of this year, had a miscarriage in the beginning of March and my period has been monthly since then. My fiancé hasn’t pulled out AT ALL! And I still get negative pregnancy test EVERY MONTH! 😞😞 my period isn’t due until next week and I’m gonna take another test and see what I get. I’m bummed by all the negatives I get! Do y’all think I should go see a fertility doctor or wait it out longer? Almost to the point of giving up on ttc honestly. 😞😞😞