Possibly pregnant after miscarriage: Edited

So I had a miscarriage back in early December 2016 so the thought of pregnancy scares me bc I'm afraid I'll miscarry again. I was off of my birth control from March 9th to the 16th like im supposed to if your on the 21 day pack so you can get your period. But I didn't actually start the next pack like I was supposed to right after I waited (forgot) for a few days....in that short time after waiting to take my birth control my fiance and I had unprotected sex a couple of times. Is there a chance I'm pregnant???