Help me figure out dpo etc


I had sex on 2/11 and was supposed to ovulate 2/12. I have tested negative daily, but I got the crazy acne on chest and tiny pulling style cramps (not period) headache asthma and gas just like I had last time I was pregnant. These happened within the first two weeks last time too. I really feel pregnant 🤷🏼‍♀️ How do I know what dpo I truly am/was? I’m so anxious, I don’t know what days I’m supposed to be testing positive. Would it show by now? I use the pregmate and first response daily. Am I drinking too much fluids for the HCG to show ( I drink a ton of water daily)