Should I test?

Guys...my baby is 7 months old and my period has been a bit irregular due to exclusively breastfeeding I started a couple days before the 1st of this month but I forgot when it ended cuz I haven’t been keeping track and 2 weeks later we have sex and he pulled out but he feels like he pre came in me a lot so I told him it’s rare to get pregnant from that but he came the night before that too and I heard sometimes Sperm will get stuck in pre cum if u come the night before or something? Well I made a tracker app and it says i ovulated the night before when we did it but I threw up last night a lot with a headache so idk if that’s a early pregnancy symptom or not 😂 this app says I’m not due for 2 days but idk 😑