Ovulation week is off schedule

So I'm not sure what else to do. I had a miscarriage back in June and my husband and I have been trying to get pregnant again for about 3 months now. I've been tracking my cycles and using the ovulation strips during my ovulation week. But last month my period was a week early which was unusual for me. And I recorded it on this app. And I bought the ovulation strips and started using them the first day and there was a faint line both days but now nothing. And yesterday and today were supposed to be my most fertile days. Is there anything else I can do to ensure that I'm not missing my fertile window? We're starting to get frustrated because everything was so easy last time and now everything seems to be against us.