Need some peace of mind

So on Saturday my boyfriend and I decided to mess around. We've never had sex but we were dry humping (just in our underwear) and he came and I felt it go through the fabric. I am on the pill and take it everyday (never missed one but have taken it late but within 2 hours of when I normally do) but I still freak out about getting pregnant because I'm a super anxious person. So since yesterday I've been feeling some cramps and my period isn't supposed to show up until next week. Anyways I just need some advice am I freaking out too much and the cramps are just PMS symptoms or should I have a reason to be nervous? Any advice would be great thanks! 😌