Bad Cramping 5 weeks pregnant

Hello po anyone here may same case po like me? I was cramping really bad after 3 days ng positive PT ko. As in parang feeling po na anytime may lalabas na period ganon po pakiramdam. Sabi ng OB ko di daw po dapat ganon 😭 I had miscarriage last year. But I jad spotting along with period like cramps. Please enlighten me po. Natatakot ako makunan uli 😢😭🙏