Pregnant??

Just want some answers so please no hate. The last time I had sex was back in October and he didn’t use a condom after I begged him to use one, he didn’t cum but there was precum. I have to go on Acutane and you can’t be pregnant and so you need to take a test once a month to make sure. So it would be my first time taking a test and I don’t have access to one otherwise. I’ve had my period the last three months and it has been heavy flow but my stomach sometimes flutters. I haven’t had really any symptoms except my boobs hurt sometimes. Does anyone have any signs or symptoms I should look out for? My period is supposed to come in 5 days.