HELP!

My periods have been irregular since I've been off birth control since June. They used to always happen around the same day every month. Now, it's always different. I keep track of them on an app. It said I was supposed to start my period February 28th. Well in February my period was the 1st-5th. It's now the 3rd and I have no symptoms what so ever of getting my period. Usually I get cramps like the day before. I'm just wondering she I should take a pregnancy test. My husband and I have had sex twice without a condom since my period.