10w and cramping

S

I’m 10w and I’m starting to get harsher cramps around the sides of my tummy. Sometimes it feels like I just need a poop and sometimes it feels like someone is stretching me inside out. I am RH negative and the baby is RH positive (or at least the midwife thinks so). So I’m quite worried as these cramps are harsher than I’m used to and my discharge is at times a bit yellow. Should I be worried?