No period after miscarriage

My cycle resumed 25 days after my miscarriage and D&C; in April.... my cycles have always been regular and on the dot and always got them 25 days apart. We had another miscarriage in December and everything was normal then too. Now i am 30 days post my first period since the miscarriage and it still hasn’t come ... I was due on June 6th. I took a pregnancy test on Saturday and it was negative. My RE said to take another test in a week and if I’m not preg and still didntget it they will have to prescribe smtnng. We had sex on June 3 without protection so is it possible the preg test wouldn’t have shown up as positive even if it were when I tested on June 9th?? That’s why my doc is saying to test again in a week I guess. Very stressful Bc I waited all this time So we could start testing since I have had two miscarriages now and I can’t test until I get my cycle back again. A little worried I could be pregnant again Bc I fear another miscarriage but also worried I’m not and my cycles are just all fucked up and I wont able to get preggo again. Anyone else have this experience where your first cycle came on time but then it didn’t come again after the second one? Or after a second miscarriage it got messed up?? Appreciate the feedback, thanks!!