Hi you any help would be great basically me and my boyfriend had unprotected sex 3 days ago partley because we would like another child and today(tuesday) I'm experiancing mild cramping in lower abdomen and brown discharge, I've read that these can be very early signes of pregnancy or is is possible they could be just period pains?(fingers crossed its not period pains) its extremely hard to say when my period is likely t be due because its all over the place.

You know, it really is to soon to tell. I would normally ask when your last period was - to see when you would be most fertile. But if your period is irregular, it would be hard to guess.
You may need to wait it out and see.

Are you taking prenatal vitamins? Have you gone to the doctor to be checked out and given the green light?