Approx 11 weeks pregnant and having occasional slight cramping and this morning i had a very little light brown discharge, is this serious?

Hopefully no: Scant spotting like this is common but should always be evaluated. If you have not had an ultrasound confirming a healthy pregnancy in the uterus, then you should have one to ensure no ectopic pregnancy. If your blood type is rh negative, you will need a Rhogam shot. Otherwise, see your obgyn on monday to check the fetal heartbeat and ensure all is well.

Probably ok: At 11 weeks if you were having a miscarriage typically the cramps are significant and the bleeding quite heavy. First a bit of mild cramping is common at this point of pregnancy. If you are still having sex its also common to having some spotting, which can be pink, red or brown for 2-3 days after sex. Cramping after sex for a day or two also common in pregnancy.