I wasn't aware I might have even been pregnant until my boyfriend and I were having sex and shortly after we'd finished, I felt this horrible pain in my stomach and when I went to use the loo, I noticed my urine was pink. I was doubled over, and couldn't move. The cramping didn't go away until late the following day and now I am stricken with sore breasts and bad heartburn. No missed period, but is it possible I already lost the baby and was the sex to blame?