Late period could i still be pregnant?

Kiia
Tmi I'm actually new here My Name Is Kia And Im Unsure If I could be pregnant if my period was late I came on yesterday morning But I felt as tho I was pretty late I usually come on at the beginning of the month since I had my daughter 4 months ago me and her dad had sex once and a little bit of his sperm was in me I was on birth control but I stop taking them beforehand because they were making me sick but after we had sex and I didn't come on my menstrual I started taking them again and finally I came on but I know a women can still be on her period and be pregnant I haven't did a test yet ..Any Suggestions???