Need help!!!

Janice • I`m 29, husband is 31. I have pcos and a bicornuate uterus. This is year 3 ttc. MC in y1 Baby #3 is now 16w 2d`s
I went on the pill (needed me time) in jan after 3 years ttc and a miscarriage. I had heavy bleeding for the first 3 weeks on the pill so had to stop it. Since then I haven't had a period apart from 3 weeks ago I had a very light brown discharge on and off for about a week and twice I had a pinhead size red blob in it. Since then the last couple of days I've had very sore nipples/tender breasts (don't normally get it) I'm also feeling sick and tired. Is there any chance I could be pregnant or is it just my normal period starting ?? Should I take a test now or wait a while longer?  
All thoughts are appreciated.  X x