Worried I could be pregnant?

Period is due in about 5 days. I'm usually pretty regular. Last couple days I've had light period like cramps and almost little flutters. My boyfriend and I use condoms but occasionally fool around with penetration before putting the condom on. Never experienced anything quite like it so I'm worried. I struggle with significant anxiety and wondered if anyone had insight into whether what I'm feeling could be pregnancy. Don't really know that there are other symptoms. I've felt a little nauseous but have been dealing with a sinus infection so may be related to that. Anything could be helpful. Thanks.