HELPPP..!!

I am 18dpo . I got a bfp three days ago 2 days after my missed AF. I neva got the implantation bleeding . Is that ok? Also I have these severe period like cramps most of the time . Is it common or should I get it checked ? I am even unable to sleep properly during the night . I have a really high pulse .. is this all ok .. pls pls pls advice .. TIA