Consistent temperature before af


This is my first month properly charting my bbt. I’ve been TTC for 8 months. All doctors say I’m fine and my husband it too. But I’ve been getting irregular periods which at first turned out to be from premature lActation even though my prolactin level was normal. I took meds and still got scanty periods so my doctor put me on duphaston to kickstart them and then later progyluton. I’ve been TTC with these meds as they are not contraceptives. This was my first month on progyluton. I tried to bd a lot and charted my temp. But I’m due for my period now and I’m getting negatives on cheapies and consistent temperature. It should be droppping or increasing. Has anyone else gotten this before a bfp?