So I woke up cramping really bad this morning. My first instinct was my period is coming on. Well I…

So I woke up cramping really bad this morning. My first instinct was my period is coming on. Well I was on Sprintec birth control pills but I haven't been taking them lately. They make me moody really bad and plus my husband wants to try for another baby. I'm cramps but my period is not really on I can't teel it's there until I wipe and it's like really light pink and it's like spotting. We have been having sex unprotected. Do anyone have an idea of what could be going on?