Im 13 weeks pregnant. I had sex Sunday night, woke up to blood Monday. Worried, put a pad on..…

Im 13 weeks pregnant. I had sex Sunday night, woke up to blood Monday. Worried, put a pad on.. checked again later. No blood on pad so i was relieved and assumed it was just sex. Nope. More blood in shower. Made an appointment when i woke up today. Doctor couldnt find a heart beat, but said it could be early and made an ultrasound appt for next Tuesday. Ive bled on and off today as well. Nothing heavy, but definitely heavier than spotting. No clots, no cramps.