Pregnant or hormones

Enisha • I'm 30 and have two children 8 and 5 currently expecting #3 a baby boy!!
Ok so I had one dose of the depo shot and I got off of it to to irregular heavy bleeding I've been off the shot for a month or two now my periods never stopped I've always had a regular 25 day cycle but this month my period has not shown up... Me and my partner had unprotected sex but we used the withdrawal method I no it's rare but a lot of people get pregnant off pre cum so far symptoms are sore/tender nipples to touch and just caught a cold out of no where it's summer time I sometimes get nauseous alot of creamy cm (tmi) so basically what I'm asking is could I be pregnant or do y'all think it's my hormones trying to get back on track?