Last month my significant other and I decided to finally not take any precautions will have sex since we had a baby in November and our last two kids are only 18 months apart. We were trying to track my cycles which were regular however, less then a week after I got my first dose of the vaccine. Since then I haven’t had my period. We did test once and it was negative. This happened to us two pregnancies again so I’m wondering if the shot could have something to do with my missed period or it’s another pregnancy. We plan to test again soon but for now I’m just wondering what could have caused this if it’s not a period.