Advice

I need some advice last month I tracked ovulation and had sex 3 days before ovulation and on ovulation day and the day after and then started my period at a normal time not pregnant …..this month I tracked my ovulation went and bought ovulation tracker a better one last night.I had my period for 5 days wasn’t expectin to ovulation or get a high to start until Sunday or Monday we’ll I tracked my ovulation last yesterday one day after my period and low I checked again Last night and again got no fertility low . This am I checked and I went straight to peak. Has this happened to anyone else before and got pregnant ? I had sex yesterday since I was off my period and this am but yesterday it was low I am so confused and frustrated

Any advice is appreciated