Period and trying to get pregnant.

I haven’t had a period since June. We started trying to get pregnant a month and a half ago. Ive been having cramps for about 5 weeks now. Bad cramps. Well yesterday i was spotting in the am and then nothing else for the whole day. Then this morning i walk into the bathroom and holy shit. I am on my period and its really heavy and dark. This sucks. Before getting pregnant with my twins, I hadn’t had a period for over a year and i got pregnant within only 2 months of starting sex with no protection. This time around its different i guess. It sucks.. why does this have to happen to me.