Hiya, first post here although I've been reading threads relating to my situation for a long time. Has anyone been pregnant and still not had a positive test even at around 14 weeks? I don't know what's going on with my body- my past two cycles have been later and lighter than normal minus the typical period feels, and now I'm waiting for a sign of af this month as I'm late again. I've been to the doctors and had multiple pregnancy tests (all negative) but my lower belly has developed a little bump- I've always had a flat belly- and I have been having back and cramping pains for the past three months straight now. I've had a molar pregnancy before so know the signs and symptoms and have been having these too..especially acne which is a sure sign for me. I wasn't planning a pregnancy so it's not just my wishful thinking! but if I am that's okay too. I've been referred for a pelvic ultrasound but it's 4 weeks away, if I am pregnant from the cycle I believe I'd be at 13+4, I don't want to miss vital scans and I'm not sure if I should be worrying about things like tumours again since I've already had a molar. 
thankyou in advance x