The odds that she is pregnant is slim. Trust me, a woman does not get pregnant every time you cum in her. I've done it a number of times and have been lucky thus far. If you are going to keep her around for awhile and she likes you to cum in her, get her on the pill. Between that and yoru steroid use, the odds of a pregnancy would be very low, not impossible, but not very likely either. Pulling out only slightly reduces the chance anyways. If you are that worried, just remember to use a condom next time.