Very unsure if it's pregnancy or pill withdrawal

Okay so December 20th I stopped taking the pill but was only on it for 3 months. I was due for my period 5 days later which was very light and only went for 3 days. In the following new year myself and my partner started trying to conceive. The first week of January I started to get really bad off the pill withdrawal symptoms, cramps, migraines, nausea. Eventually, they went away. I should of been ovulating on the 15th, thats if my body doesn't mess around after getting off the pill. This week I've been getting migraines again, feeling a little nauseous and getting really sore to touch nipples. I've taken hpt but all come up negative but these were taken before my period was due date. I have a side of me that thinks I'll be pregnant but at the same time I don't wanna give myself false hope. Anyone had symptoms like this or experienced this after coming off the pill? Or any advice people can give me? Thanks :)