Help I'm stuck!! Period or pregnant

Me and my husband has been together for a while now. We are like best friends tell each other everything. But when we start talking about kids he say he wants them but not right now..a few days goes by and he starts talking about us and how he wants one now, and ive always knew he be the one I'd be with since u met him. And u want kids NOW!!! But my period is so messed up k can't keep up when I'm fertile and not can someone please tell me what to do and how I can get pregnant? And sex is not a problem we have sex a few rims a week.
1 he pointed out my chest is gotten bigger a long with my butt.
2weve been here before though where we though I was.
3i don't try all the time to get pregnant only some.
4 it hurts some what to lay on my stomic. 
5im wanting M&M and mnt dew all the time..
Period or pregnant?!?