Possibly pregnant 6 PP?!

Has anyone gotten pregnant before their 6 week check up? I know they say wait a good year before ttc after a c-section but I can’t take birth control so we solely use pull out and always have and even then it took over 2 years to get our daughter once we actually started trying after 6 years... that said I formula feed and never really had pp bleeding and haven’t had a period yet and we started having sex again 3 weeks pp... she was born 6.5 weeks ago now... I’ve had headaches for 2 weeks, cramps for a few days and smells and certain foods are awful lately... I’m nervous as I know it’s risky if I’m pregnant again and I know I should test but I’m scared. Just wondered if anyone has experienced this. Thank you!