I’m so confused! Anyone also having this issue?

This year I got pregnant 3 times very easy some without a period in between. We lost all three! Doctor said give your body a break let your cycle come back. Well we did that. Two months I’ve tracked my ovulation had sex when I’m supposed to. Now for four months we haven’t got pregnant. There was no reason why we lost our babies but now I’m scared I can’t get pregnant anyone have this issue? Period comes on time so does ovulation.