Ladies who have Irish twins!

So I am 8 weeks PP and still have yet to have a period. I am starting to wonder if I am pregnant i took a test last week negative but I'm waiting off to see if I get my period in the next week. Anyways what were your signs you were pregnant before your first PP period? I don't even know what to look out for at this moment. I am constantly bloated, constipated, and cramping which could just be signs af is on her way I just want to know your experiences just incase I could very well be scaring myself.