Unlikely to be pregnant... right?

Sooo my husband and I don’t use any sort of contraception, we’re not trying but we’re not not trying to get pregnant. We were having sex quite a bit before my period cycle was suppose to start. About a week and a half later I did get a period but it was abnormal, light and wasn’t as long as a typical 5 day period. This week I’ve been noticing my energy level being very low and I’ve been very nauseous. My husband keeps telling me he thinks we’re pregnant. But I tell him I’ve had a “period”. I’ll do a test to make sure but I just wanted some other females input! 💕