I get dizzy & I get more headaches now

I've started birth control 2 months ago and this month I find myself taking tylenol more from headaches I get dizzy spells as well & im scared almost because I'm 2m postpartum & Im thinking now that I could be pregnant idk like I said it's my first time with birth control pills I take them everyday at 5 pm it's just some days I take it at 5:10 or like yesterday i took it at 5:37 I'm hoping I'm not messing up..i love my baby but I want to wait for next baby at least a couple months more if it's not that then I was reading on the side effects and headaches and dizines is a serious problem and I should seek medical help.. What the hell... ladies have y'all gone through this?