...would take effect in a week.? My doctor told me told me to take a pregnancy test two weeks after she gave me the shot, but I didn't. She also told us to have protected sex or no sex at all until it took effect. my husband and I had unprotected sex anyway during that week after I took the shot, before it took effect but used the withdrawal method. my next menstrual cycle was supposed to be around February 16 but I never got it. A week after I missed my period (around February 23), I took the pregnancy test and it was a negative. But for a couple of days, I've been having this feeling that I need to use the bathroom but I don't really have to. I also don't have any other pregnancy symptoms like tender swollen breast, sore nipples, fatigue, increased sensitive to odors. But my stomach do feel a little weird. It's hard and I always feel the need to burp. Could I be pregnant?