AM I PREGNANT?

Hello everyone.

Since a couple of months I stopped taking birth control (for mental health reasons). My cycle is now pretty regular. 16 days ago I had sex with my boyfriend without a condom. (He did not cum inside me.) Now I’m kind of having a pregnancy scare. Today I had some brown vaginal discharge. I looked this up and read that it might be an implantation bleeding. In 5 days I will have my next period normally so it would be possible. Because of the lockdown due to Covid-19 it’s not really easy for me to go get a test. I don’t have any other pregnancy symptoms, except that I had some pain in my lower belly a couple of days ago. Should I really get worried? What would be the chance that I am pregnant when he didn’t come inside me ? Thanks !