Pregnancy after baby question

Wasn't sure where to post this... But here's bck story:: I had my son 7 weeks 2days ago. I started the mini pill when he was 4 weeks old. I had a bad side affect of a severe headache for 2weeks straight! I also stopped bleeding at 2weeks. Had my first period last Friday to Monday. Well anyways last night my husband an i had sex for the first time since I had my son. I'm so nervous about getting pregnant. My first was planned but obviously it's too soon or baby #2. It took us 2 years to get pregnant with our son so I don't think I'd get pregnant the first time having sex since having my son. Btw just incase people ask why I'm not on a new bc it's because I'm not able to have anything with too much hormones because of what the depo did to my body after being on it for 5years. The mini pill was my only option with breastfeeding an least amount of hormones.