Please help

Tam

Ok so I stop using OPK, now I had a period on the 11th of July and then TTC after that cycle then I got my Ladies then counted the days from the 11th till the 18th of aug then got my ladies on the 19th of aug so the cycle I counted was 39 days now on glow it said fertile week started 2nd of September till the 8th of September well I did BD but this time I didn't use OPK but my other apps say on the 8th of September I started the fertile week so I just brought ovulation kit and took the test now and got a positive soooo do I keep BD and plus I have got pains in my lower belly feels like period but less pains and I'm not due for my ladies yet