Not quite sure what’s going on

I’ve felt off here lately. Over the last year or so my periods have went from terribly irregular ( going months without) to every month. I’ve kept track of them on Glow and it’s about right every month. I had my period about 2 weeks maybe 3 weeks ago. It wasn’t typical tho. No cramps. Which was weird. Much lighter then usual. I thought maybe it was because I’ve been working a lot. Well this past week or so I’ve been nauseated. Not throwing up but feeling like I could if that makes any sense. Me and my husband are sexually active but unfortunately he got locked up about 3 weeks ago give or take a few days. I haven’t been with anybody else. I’m really not trying to be pregnant. But I’m not understanding what’s going on. I woke up this morning with dull but painful cramps in my pelvis. Feels like in my tailbone also. I thought maybe gas but somethings going on. Any advice!? I googled it but google has me thinking I’m dying rn. Please help!!