Hi.
Hcg levels 15 means indiscriminate levels.A level less than 5 means negative
pregnancy and >25 is positive for pregnancy. Now this level and then a falling level means either ectopic pregnancy or
missed abortion or pregnancy did not occur. For this you need to take a TVS( internal scan).
Regesterone will have affect on the baby. It is being given to you to get your periods.
Thanks.