I took microlut from when DS was about 6 months old until when we stopped BF at 14.5 months. I actually hadn't had AF when I started taking it but DH and I knew we were not ready for another bub yet and I was getting nervous about relying on BF alone as contraception. So I saw my GP and got a script for microlut, started taking it and within a week..... AF appeared . We were still on about 5-6 BF a day so I blame the microlut for AF. Then AF appeared every 2 weeks for a while (sometimes light, sometimes just spotting sometimes full on AF), I tried to take it at the same time every day but that is just impossible for me. I persevered with it until we stopped BF at 14.5 months and I could take the normal pill again. So in my opinion I think it's probably the microlut messing your body around a little but if you are actively ttc maybe you should take hpt to be sure. Good luck.