TTC for Baby #1

I was on depo for about a year and half other birth control methods for 5 total this is our first cycle that i did opk and had two positives he had to go out of town on my o day but we dtd two and one day before i had cramps about 5 dpo but have gotten bfn since 8 dpo including today which is 15 dpo i had a lot of cm yesterday and today im having mild cramps mostly in my back my last shot was 6/2018 i have had a period pretty much every month since September except october and went 33 days without af then got it in november and another two weeks later and had a normal cycle in January any input would be nice I wish I never would have went on this but too late now but i just wonder if im pregnant or if im going off cycle again any input would be nice tia