Advice pleaseee... Ttc with irregular periods

Hiya all 
Okay so here is my problem... I used to have regular monthly cycle until I started ttc... And now they are getting further and further apart every month I try 

I am using a sperm donor and started off using artificial insemination but as that wasn't working So I have been using partial imsemination since June.. I wasn't sexually active until I started ttc... 

Anyway here are my cycle lengths:
April - 40 days
May into June - 37 days 
July - 41 days
August - I'm currently on day 43 

Af came on August 17th and I ovulated on sept 15th according to my okp and cm... I had intercourse on the 9th sept and 14th sept... And also tried pre-seed for this first time this cycle.. Then I think I may have ovulated again during last week (not 100% sure tho) as had a posotive ovulation test again just line wast as dark but was there and also I have had a little but of discharge and then on Tuesday I had a random blob of ewcm with streaks of blood in (which iv never had before) when I went to the toilet... I haven't had anything since apart from a few cramps... I did a hpt yesterday when I got home from work as I guessed I would be due on around now according to my app on my phone... 

Anyway don't have any pregnancy symptoms and only sign of my period is spotty face (seem to be a lot more than usual tho) and cramps but they aren't as bad as they usually are and have stopped with no sign of Af... 

I'm sorry this is sooo long but I am at a loss and don't no what to do... I don't know how I can concieve when I don't no when my periods are... Please if you have any advice let me no... 

Thank you for reading if you got this far.. Sorry for the ramble...