Not sure what's going on!!

So I ran out of my birth control and hadn't been on it for two weeks, my last period was oct 24-27 (usually only lasts 3 days so that's normal) me and my boyfriend had unprotected sex halloween night and many times after that when I wasn't on my bc and he came in me everytime... Since I started my bc at a different time than usual, I'm not sure when I'm supposed to get my period again. But I've been having cramps which doesn't happen when I'm on the pill, I feel like I have to poop or am gassy a lot through out the day, I'm moody, but no other symptoms. I've been came in a lot before I was even on the pill and I never got pregnant. Idk if I'm just stressed or if it's just gonna come at a different time since I started my pill late. I took a digital pregnancy test two days ago but it came up negative... HELP I'm only 19 lol