I haven't missed my period yet however I had sex on the 13th, 19th and 28th December, I've been having back pain, lower abdominal pain, achy hips, sore breasts, tired, dizziness now and again, I was on my period on the 28th when I had sex, today I started bleeding however it was red/brown/pink it was reallt heavy at first then got lighter and I think it's going to stop, I need advice I'm really scared