Ongoing Cycle Changes

Last year in February I decided to get off of the pill as I was on it since I was 16. Since getting off the pill I have consistently been getting my period as normal. In October last year me and my husband finally decided that trying for a baby is what we wanted and since then my period cycles have been irregular. In December I missed my period around my normal time and ended up getting it at the beginning of January. Then I missed my period once again this month and tested the day after I missed and still got a negative. I dont know if Im worrying too much about getting pregnant but was just wondering if anyone has ever experienced this? Just needing some encouragement really🙏🏽