Possibly Pregnant??

Looking for some insight! I came off of birth control at the beginning of February (pill) and had a “period” on February 6th for 4 days. I’m thinking that was withdrawal bleeding from being off the pill and not an actual period. I had lower back aches on Monday, lower stomach cramps on Tuesday and some on Wednesday, now no cramping except my breast have been very tender this week. . My period should have came this week and it hasn’t come yet. I haven’t taken a test yet because I was waiting to see if my period would come. Has anyone ever experienced this? Possibly pregnant? Usually if I get cramps I get my period the same or next day...it’s been 4 days now and still nothing.